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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
San Tan Valley, Arizona, gets 10 inches of rain per year. The US average is 39. Snowfall is 0 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 20. On average, there are 292 sunny days per year in San Tan Valley, Arizona. The July high is around 105 degrees. The January low is 41. Sperling's comfort index for San Tan Valley is a 75 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54.